Detachable coupling



Oct. 17,` 1944. 1 CLLCKNER 2,360,761

DETACHABLE COUPLING Filed May 15. 1942 -1N V EN TOR. JAA/15s f CZ /cKA/f/QD ATT RNE Y Patented Oct. 17, 1944 DETACHABLE COUPLING James E. Clickner, Dearborn, Mich., assignor to ompany, a corporation of The Flex-O-Tube C Delaware Application May 15, 1942, Serial No. 443,026

2 Claims.

This invention relates to detachable couplings for flexible hose and has for its primary object the providing of a simple, inexpensive and effective two piece detachable coupling whereinr maximum gripping of the hose by anchorage of the hose within the coupling member may be accomplished without deleterious effect upon the hose.

Another object of theinvention is to provide a detachable hose coupling for flexible hose whereinmaxlmum gripping occurs at the point within the tting where minimum tensile and flexural stress may be developed in the hose.

A further object of the invention is to provide a detachable hose coupling for flexible hose of the type in which the hose is gripped between an outer shell and inner stem wherein the innermost portion of the hose is gripped with a viselike biting engagement leaving the outermost portion of the hose within the shell under firm but less rigorous grip whereby to gain the advantage of maximum anchorage of the hose within the coupling member without the usual cutting and tearing of the hose when subjected to repeated tensile and flexural stresses.

Other objects of the invention will become apparent by reference to the following detailed description taken in connection with the accompanying drawing, in which:

Fig. 1 is an exploded longitudinal sectional view of a detachable ilexible hose coupling embodying the invention disassembled from a piece of flexible hose shown therewith.

Fig. 2 is a partially exploded longitudinal sectional view similar to Fig. 1 showing the flexible hose assembled in the shell of the detachable coupling.

Fig. 3 is a longitudinal sectional view of the detachable hose coupling disclosed in Figs. 1 and 2 completely assembled on the end of a flexible hose.

Referring now to the drawing wherein like l numerals refer to like and corresponding parts throughout the several views, the particular hose coupling selected to illustrate the invention comprises a shell member I0 internally threaded at II which accommodates the end of a hose I2 and having an internally threaded neck portion I3 which receives an externally threaded hollow stem member I4 which is proportioned and threaded as hereinafter described in detail. The internal diameter of the hollow stem member I4 is as large as possible to give a minimum of restriction to flow of fluids therethrough. The shell member I0 is preferably provided with a hexagonal wrench grip |00 and the stem member I4 is preferably provided with a hexagonal wrench grip |40 by means of which the hose coupling may be assembled onto the hose I2. The stem member I4 outwardly of the wrench grip |40 is shown as a male pipe coupling I5, however, any desired coupling element or the like may be substituted for the coupling element I5 shown.

The portion of the stem member |4'which extends into the shell member I0 is provided with a full depth coarse thread I6 adjacent the wrench grip |40 and is provided with ailattened partial depth coarse thread I'I near the end thereof which is tapered to an annular blunt nose I8. The foregoing threads are provided by turning the stem member I4 to the desired diameter and taper, and then threading the same with a full depth die which provides th threads IB and Il with .a single threading operation. The threads I9 of the internally threaded neck I3 ofthe shell member I0 are complementary to the full depth threads I6 of the shell member I0, both the full depth threads I6 and flattened threads Il of the stem member I4 being operatively engageable therewith. The internal threads 20 of the shell member I0 are preferably ropposite hand with respect to the internal threads I9 of the internally threaded neck I3 of the said shell member I0 whereby to admit of assembly of the coupling member onto the hose I2.

'I'o assemble the coupling member I0 onto the hose |2, the shell member I0 is first threaded onto the end of the said hose I2 until the end of the said hose I2 is in rm abutment against the annular face 2| at the inner extremity of the shell member I0. The stem member I4 is then threaded into the internally threaded neck I3 of the shell member I0 until the wrench grip |40 comes in contact with the annular end 22 of the said neck member I3. During this latter assembly operation, the stem gradually into the inner end of the hose I2, first with a rm pressure developed between the internally threaded shell member I0 and the externally half depth threaded end I1 of the stern member I4, and then with a vise-like biting grip to provide absolute Ianchorage of the innermost end of the hose threaded shell member I0 and the externally full depth threaded portion I6 of the stem member I4.

Thus, the hose I2 is positively held at the innermost portion of the shell member I0 in a vise-like biting grip type anchorage, and, at the outer portion of the shell member I0, the hose I4 is threaded I2 between the internallyl I2 is engaged within Vthe shell member I 0 by a rm grip with no extreme biting of the shell threads 20 into the outside of the hose and no biting whatsoever of the stem member I4 into the inside of the hose. This admits of the flexing and tensioning of the hose with respect to the coupling member without deleterious effects', and, at the same time, positive anchorage of the hose l2 within the shell member l0 is assured axially inwardly of the end ofthe shell member and inwardly of the zone of greatest stress on the hose and the zone of likelihood ofrupture of the hose.

Although but one embodiment of the invention has been disclosed and described in detail, it is obvious that many changes may be made in the size, shape, arrangement and details of the various elements of the invention without departing from the scope thereof as defined by the appended claims.

I claim:

1. In a detachable coupling for flexible hose, an internally threaded shell member, a centrally apertured base integral therewith and an internally threaded neck on said base, a flexible resilient hose threaded into said shell member and into abutment with said base, an externally threaded hollow stem member including a wrench grip and coupling element at one end and having the other end formed blunt and provided with a coarse thread of full depth nearest said wrench grip and flattened to partial depth at the outer portion thereof, the said blunt end of said stem member being threaded through said threaded neck into the bore of said flexible resilient hose within said shell member first gripping the said hose lightly through engagement of said partial depth threads therewith and nally anchoring the inner end of said hose within said shell member with a vise-like biting engagement through engagement of said full depth threads therewith.

2. In a detachable coupling for flexible hose, an internally threaded shell member, a centrally apertured base integral therewith and an internally threaded neck portion on said base, a resilient flexible hose received in said shell member, and a. hollow stem member including a wrench grip and coupling element at one end and formed blunt and threaded at the other end into and through the internally threaded neck of said shell member into engagement with the said resilient flexible vhose anchoring the said hose lbetween the said shell member and said stem member, the threads of said stem member being of uniform coarse pitch full depth at the portion thereof nearest said wrench grip and flattened at the outer portion thereof whereby to engage and anchor the said hose with a positive viselike biting grip at the innermost portion of said shell through engagement of said full depth threads therewith and engage the said hose with a lighter grip at the outermost portion of the Vsaid shell through engagement of said flattened threads therewith to admit of flexing of the hose with respect to the said shell member without deleterious effect on said hose.

JAMES E. CLICKNER. 

